Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
NAFLD Activity Score (NAS)
| Grade | Steatosis | Ballooning degeneration | Lobular inflammation (x200 magnification) |
|---|---|---|---|
| 0 | <5% | None | None |
| 1 | 5%–33% | Mild (few, pericentral) | <2 foci |
| 2 | 33%–66% | Prominent (many, scattered) | 2–4 foci |
| 3 | >66% | >4 foci |
NAS=Steatosis degree + Ballooning degree + Lobular inflammation degree. NAS Score has a value between 0 and 8.
